Intel Core i5-1145GRE vs Intel Core i5-8300H Comparison

Head-to-Head Benchmarks

The recorded data shows a clean sweep for the Intel Core i5-1145GRE across all six head-to-head Cinebench tests. The i5-1145GRE wins every benchmark, with margins ranging from 11.9% to 12.5%. This consistency is notable; the performance gap remains tightly clustered rather than varying by workload type.

In the Cinebench R15 suite, the i5-1145GRE scores 705 in multicore against 629 for the i5-8300H, a 12.1% lead. The single-core result is slightly larger in percentage terms: 99 versus 88, a 12.5% advantage. These two results establish the pattern early, and the R20 tests follow almost identically. The i5-1145GRE posts 2940 multicore versus 2622, again a 12.1% delta, while single-core shows 414 versus 370, an 11.9% edge.

The R23 benchmarks, which are the most recent and demanding of the Cinebench series, confirm the trend with the same 12.1% multicore delta: 7001 versus 6245. Single-core R23 gives the i5-1145GRE 988 points against 881, another 12.1% margin. The fact that the multicore delta is exactly 12.1% in three different Cinebench versions suggests a very stable performance advantage that scales linearly with the workload, rather than a scenario where one processor excels in a specific niche.

The i5-8300H has one additional benchmark in the database, Geekbench, where it scores 3920 multicore and 1286 single-core. These numbers are not part of the head-to-head comparison, as the i5-1145GRE lacks a Geekbench entry. However, the i5-8300H's average benchmark score of 2005 places it in the 45th percentile of all CPUs, exactly matching the i5-1145GRE's 45th percentile. Despite losing every head-to-head test, the overall average scores are close: the i5-1145GRE averages 2025, while the i5-8300H averages 2005, a difference of only 1%. This indicates that the i5-8300H's additional Geekbench results help it partially close the overall gap, even though it loses all direct comparisons.

Architecture Differences

The two processors come from different generations and process nodes. The i5-1145GRE uses Tiger Lake-U architecture on Intel's 10 nm process, while the i5-8300H uses Coffee Lake-H on 14 nm. The process node difference is significant: 10 nm versus 14 nm, which contributes to the i5-1145GRE's higher efficiency per clock and its ability to reach higher boost frequencies despite a much lower thermal design power.

The i5-1145GRE has a base clock of 1500 MHz and a boost clock of 4.10 GHz. The i5-8300H starts higher at 2300 MHz base but boosts to only 3.90 GHz. Despite the 800 MHz lower base clock, the i5-1145GRE still wins all benchmarks, showing that its newer architecture and higher boost clock more than compensate for the lower idle frequency.

Cache structures differ substantially. The i5-1145GRE has 80 KB of L1 per core, 1.25 MB of L2 per core, and 8 MB of shared L3. The i5-8300H has 64 KB of L1 per core, 256 KB of L2 per core, and a larger 12 MB of shared L3. The i5-1145GRE's L2 cache is nearly five times larger per core, which likely helps with data locality and reduces the frequency of L3 accesses. The i5-8300H compensates with a 50% larger L3 pool, but the benchmark results suggest the larger L2 is more impactful for these workloads.

Die size also differs meaningfully. The i5-1145GRE measures 144 mm², while the i5-8300H is smaller at 126 mm². The larger die reflects the more complex Tiger Lake design, which integrates the Iris Xe Graphics G7 with 80 execution units. The i5-8300H pairs with the older UHD 630 integrated graphics, which has fewer execution resources. Both processors support DDR4 memory, but the i5-1145GRE adds LPDDR4X support and dual-channel memory, while the i5-8300H's memory bus information is not recorded. The i5-1145GRE also supports ECC memory, a feature absent on the i5-8300H.

PCIe support differs as well. The i5-1145GRE supports PCIe Gen 4 with 4 lanes available from the CPU, while the i5-8300H has no PCIe information recorded in the database. The i5-1145GRE uses the Intel BGA 1449 socket, while the i5-8300H uses Intel BGA 1440, meaning they are not socket-compatible.

Where Each One Wins

The i5-1145GRE wins all recorded benchmark categories, so the distinction is less about which processor wins and more about the nature of its advantages. In single-core tests, the i5-1145GRE leads by 12.5% in R15 and 11.9% in R20. This suggests its higher boost clock of 4.10 GHz and newer microarchitecture provide a clear advantage in lightly threaded tasks like everyday productivity, web browsing, and legacy applications that rely on single-thread performance.

In multicore tests, the i5-1145GRE maintains a consistent 12.1% lead across R15, R20, and R23. Since both processors have 4 cores and 8 threads, the multicore advantage comes entirely from architectural efficiency and clock speed rather than additional parallel resources. The 28 W TDP of the i5-1145GRE versus 45 W for the i5-8300H is remarkable in this context; the newer processor delivers higher multicore throughput while consuming less power, which matters for thermally constrained mobile chassis.

The i5-8300H's only recorded advantage appears in the Geekbench tests, where it posts scores of 3920 multicore and 1286 single-core. However, these are standalone results with no direct comparison available. Its average benchmark score of 2005 is within 1% of the i5-1145GRE's 2025, suggesting that in broader workloads beyond Cinebench, the i5-8300H may be more competitive. The i5-8300H also has a larger 12 MB L3 cache, which could favor certain data-heavy workloads, though no benchmark in the database isolates this effect.

For users prioritizing raw Cinebench rendering performance, the i5-1145GRE is clearly superior. For those considering the i5-8300H, its end-of-life production status and 45 W TDP make it less attractive for new designs, but its additional Geekbench data suggests it remains capable in general-purpose tasks.

Specification Differences

The two processors differ in several key specifications. Base clock: 1500 MHz on the i5-1145GRE versus 2300 MHz on the i5-8300H. Boost clock: 4.10 GHz versus 3.90 GHz. TDP: 28 W versus 45 W. Socket: Intel BGA 1449 versus Intel BGA 1440. Process node: 10 nm versus 14 nm. Die size: 144 mm² versus 126 mm².

Cache configuration diverges: L1 is 80 KB per core versus 64 KB per core, L2 is 1.25 MB per core versus 256 KB per core, and L3 is 8 MB shared versus 12 MB shared. Memory support: DDR4 and LPDDR4X versus DDR4 only. The i5-1145GRE supports ECC memory; the i5-8300H does not. PCIe: Gen 4 with 4 lanes on the i5-1145GRE, with no PCIe data recorded for the i5-8300H.

Integrated graphics differ: Iris Xe Graphics G7 80EU versus UHD 630. Release dates are 2020-09-01 for the i5-1145GRE and 2018-04-01 for the i5-8300H. Production status: the i5-1145GRE is active, while the i5-8300H is end-of-life. The i5-1145GRE has a launch MSRP of $362; no launch MSRP is recorded for the i5-8300H. Both processors have 4 cores, 8 threads, and locked multipliers.

FAQ

Q: Which processor has a higher boost clock?

A: The Intel Core i5-1145GRE boosts to 4.10 GHz, while the Intel Core i5-8300H boosts to 3.90 GHz.

Q: How much faster is the i5-1145GRE in multicore Cinebench R23?

A: The i5-1145GRE scores 7001 versus 6245 for the i5-8300H, a 12.1% advantage.

Q: Do both processors have the same core and thread count?

A: Yes, both have 4 cores and 8 threads.

Q: What is the TDP difference between the two?

A: The i5-1145GRE has a TDP of 28 W, while the i5-8300H has a TDP of 45 W.

Q: Which processor supports ECC memory?

A: The i5-1145GRE supports ECC memory; the i5-8300H does not.

Q: Are these processors socket-compatible?

A: No, the i5-1145GRE uses Intel BGA 1449, while the i5-8300H uses Intel BGA 1440.

The Verdict

The data is unambiguous: the Intel Core i5-1145GRE outperforms the Intel Core i5-8300H in every head-to-head benchmark recorded. The 12.1% multicore advantage across three Cinebench versions and the 11.9% to 12.5% single-core advantage are consistent and substantial. The i5-1145GRE achieves this while drawing 28 W compared to 45 W, using a newer 10 nm process, and supporting features like ECC memory, LPDDR4X, and PCIe Gen 4 that the i5-8300H lacks.

The i5-8300H is not without merit. Its average benchmark score of 2005 is only 1% below the i5-1145GRE's 2025, and its Geekbench results indicate solid general-purpose performance. Its larger 12 MB L3 cache may benefit certain workloads, and its higher 2300 MHz base clock could help in sustained loads that stay below boost frequencies.

However, the i5-8300H is end-of-life, uses an older 14 nm process, and loses every direct comparison. For new system designs, the i5-1145GRE is the clear choice from a performance standpoint. The i5-8300H remains a viable option only for those specifically seeking its larger L3 cache or working within the BGA 1440 socket ecosystem, where the database shows no performance advantage to justify the higher power draw.